Hot-bed frame.



PATENTED JAN. '29, 1907.

W. H. LUGKAU.

" HOTBED FRAME. APPLIOATION riLEn JUNE 7, 1906.

VVILHELM HEINRICH LUOKAU,

OF MIKGDEBURG, GERMANY.

HOT-BED FRAME.

Specification of Letters Patent.

Patented Jan. 29, 1907.

Application filed June 7, 1906. Serial No. 320,721.

T on whom it may concern.- I Be it known that I, WILI-IELM HEINRIOI-I I LUCKAU, cooper, a subject of the King of Prussia, German tmperor, residing at 48 Schrotestrasse, Magdeburg, Germany, have invented a new and useful Improvement in Hot-Bed Frames, of which the following is a specification.

The frames and cross-bars made of wood iron for hot-beds, covers for hothouses, and the like are injured in a very short time rots and the iron rusts.

- vided by the use of a pipe;

While the wood has at least the advantage of being a poor conductor of heat and of being light in weight, the framework constructed of iron is invariably heavy, cold, and possesses so little elasticity that in case of a slight bending caused by uneven support the breaking of the panes of glass is the result. I

In my present invention, as opposed to the I foregoing, frames for hot-beds and the like are to be constructed which are almost indestructible by the effects of the weather, do not become cold, and whose weight is not much greater than that of wooden frames.

The drawings illustrate the construction of such a frame and show, Figure 1, the transverse section of a piece of the frame with a bar of wood still lying inside Fig. 2, a transverse section' through a cross-bar, as in Fig. 1; Fig. 3, a transverse section through a piece of the frame with a hollow space therein pro- Fig. 4, the section of a cross-bar of the same kind; Fig. 5, a part of a frame entirely put together, on a reduced scale to the Figs. 14.

Of thin metal coated with zinc bent to a crosssection, so as to serve the purpose for I which it is intended, a rim a, open on one side, is made. On the upper part are provided I surfaces b,'on which the glass 0 rests, and under certain circumstances also a correspond- I ing groove (1 to receive the material for tightening. The edges in the open part of the rim are bent around toward the interior 6.

The profile rim, constructed as just describe is now, placed in a corresponding supi port, which lies against the outer surfaces and prevents it from bending outward during the procedures which now follow.

by the effects of the weather, as .the wood I I In the hollow rim is placed up to a certain height a material which is similar in composition to the wellknown artificial wood sub stitutet'. e., a mixture of sawdust, corkmeal, peat, and the like, with magnesium chlorid and magnesite as binding substance or in general a cement-like material. Immediately thereupon a wooden barf, which can be wedge-shaped in conformity to the purpose for which it is used, or a thin metal pipe is pushed in, which presses the material in all nooks and corners and causes it to attach itself firmlyto the outer rim, as well as to the bar which has been pressed in. Now the opening remaining in therim is filled completely to the lower edges and stopped up.

After the material has hardened a bending out of the free ends 6 of the rim is impossible, as they are held fast by the hardened material.

In order to make the frame lighter and to make it a poorer conductor of heat, a hollow space inside the material can be provided for by drawing out the wooden or also the tube like bar, which had gitudinal direction after the rim has been filled and stopped up.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In hot-bed frames the rims and crossbars made of thin metal, which are open at one side and with edges bent in, a cementlike substance filling up said hollow rims and bars except for a means, in the midst of the filled-in mass, said means comprising a poor conductor of heat, all as described and shown.

2. In hot bed frames the rims and crossbars made of thin metal, which are open at one side and with the edges bent in, a cementlike substance filling up said hollow rims and bars, a tube of thin metal forming by its hollow space a poor conductor of heat lying in the midst of that filled-in mass, all as and for the purpose set forth.

In witness whereof I have hereunto set my hand in presence of two witnesses.

WILHELM HEINRICH IIUOKAU.

Witnesses:

ALFRED BI'JHRING, JAMES L. A. BURRELL.

been pressed in in a lon 

